Image processing apparatus accepting specific printing function, image processing method, image forming apparatus, and storage medium

An image processing apparatus of the present invention includes a plurality of PDL processing units configured to execute analysis processing corresponding to a type of PDL data, an operation unit configured to accept a user's instruction for implementing a specific printing function, and a control unit configured to control execution of printing processing based on the user's instruction accepted by the operation unit. The control unit starts, in accordance with the acceptance of the user's instruction by the operation unit, reserving work memory to be used for the analysis processing by a PDL processing unit, among the plurality of PDL processing units, which corresponds to PDL data included in a print job associated with the user's instruction.